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Displaying 51 - 75 of 147

Uncertainties of Spectral Responsivity Measurements

June 13, 2006
Author(s)
George P. Eppeldauer, G Sauter, James Gardner
Uncertainty estimates of detector spectral responsivity measurements are discussed. A model describes independent (uncorrelated) uncertainty components at a given wavelength based on the measurement equation for test detector calibrations. Systematic

Development of the NIST Detector-based Color Temperature Scale

May 17, 2006
Author(s)
George P. Eppeldauer, Yoshihiro Ohno
Based on the spectral responsivity of the channels of a tristimulus colorimeter, a color temperature scale is being developed at NIST. The low uncertainty of the spectral responsivity measurements can dominate the chromaticity measurement uncertainty. New

Development and Calibration of Pyroelectric Radiometer Standards at NIST

April 21, 2006
Author(s)
George P. Eppeldauer, Jinan Zeng, Leonard M. Hanssen
The reference spectral power responsivity scale of NIST is being extended from the silicon range to the infrared (IR) using pyroelectric radiometers. Two transfer standard pyroelectric radiometers have been developed at NIST. The main design consideration

Development and Application Issues of a Spectrally Tunable LED Source

June 8, 2004
Author(s)
George P. Eppeldauer, Steven W. Brown, G Dezsi, Irena Fryc, Yoshihiro Ohno
A spectrally tunable solid state source based on Light Emitting Diodes (LEDs) is being developed at the National Institute of Standards and Technology (NIST). The tunable source will emulate the spectral distributions of various light sources and can be

Design and Characterization of a Photometer--Colorimeter Standard

May 1, 2004
Author(s)
George P. Eppeldauer, M Racz
A photometer/tristimulus colorimeter has been developed at the National Institute of Standards and Technology (NIST) to realize a color scale. A novel construction was developed to implement the spectral responsivity based scale with small uncertainty. The